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POJava Threads: Memory Leak
 

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    <p>I implemented simple server-client chat in Java. Here the source for the server:</p> <pre><code>public class Server { final private static int PORT = 50000; private static class Read extends Thread { private static Socket socket; private static String address; public Read(Socket socket) { this.socket = socket; address = socket.getInetAddress().toString().substring(1); } public void run() { try { BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); String msg; while (true) { msg = in.readLine(); if (msg == null) { in.close(); return; } System.out.println(address + ": " + msg); } } catch (IOException e) { e.printStackTrace(); } } } private static class Write extends Thread { private static Socket socket; public Write(Socket socket) { this.socket = socket; } public void run() { try { PrintWriter out = new PrintWriter(socket.getOutputStream(), true); BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); String msg; while (true) { if (socket.isClosed()) { out.close(); return; } if (stdin.ready()) { msg = stdin.readLine(); out.println(msg); } } } catch (IOException e) { e.printStackTrace(); } } } public static void main(String[] args) throws IOException { ServerSocket serverSocket; boolean listening = true; serverSocket = new ServerSocket(PORT); while (listening) { Socket socket = serverSocket.accept(); String address = socket.getInetAddress().toString().substring(1); System.out.println("Connection Established " + address); Thread read = new Read(socket); Thread write = new Write(socket); read.start(); write.start(); try { read.join(); write.join(); } catch(InterruptedException e) { } socket.close(); System.out.println("Connection Closed " + address); } serverSocket.close(); } } </code></pre> <p>It works fine but there is a problem. For every established connection the memory continuously grows. I presume the problem is that the memory allocated for the threads is not released afterwards but I'm not quite sure. How can I fix that?</p> <p>EDIT: The client program:</p> <pre><code>class Client { final private static int PORT = 50000; private static class Read extends Thread { private Socket socket; private String address; public Read(Socket socket) { this.socket = socket; address = socket.getInetAddress().toString().substring(1); } public void run() { try { BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); String msg; while (true) { msg = in.readLine(); if (msg == null) { System.out.println("Connection closed " + address); System.exit(0); } System.out.println(address + ": " + msg); } } catch (IOException e) { e.printStackTrace(); } } } private static class Write extends Thread { private Socket socket; public Write(Socket socket) { this.socket = socket; } public void run() { try { PrintWriter out = new PrintWriter(socket.getOutputStream(), true); Scanner sc = new Scanner(System.in); String msg; while (true) { msg = sc.nextLine(); out.println(msg); } } catch (IOException e) { e.printStackTrace(); } } } public static void main(String[] args) throws IOException { PrintWriter out; BufferedReader in; Scanner sc = new Scanner(System.in); while (true) { //for the test only Socket socket = null; try { socket = new Socket("78.90.68.125", PORT); } catch(java.net.ConnectException e) { System.out.println("Connection error: host unreachable"); System.exit(1); } /* String address = socket.getInetAddress().toString().substring(1); System.out.println("Connection established " + address); Thread read = new Read(socket); Thread write = new Write(socket); read.start(); write.start(); try { read.join(); write.join(); } catch(InterruptedException e) { e.printStackTrace(); } finally { */ socket.close(); // } //System.out.println("Connection closed " + address); } } } </code></pre>
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